three 基础库
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/**
* Two pass Gaussian blur filter (horizontal and vertical blur shaders)
* - described in http://www.gamerendering.com/2008/10/11/gaussian-blur-filter-shader/
* and used in http://www.cake23.de/traveling-wavefronts-lit-up.html
*
* - 9 samples per pass
* - standard deviation 2.7
* - "h" and "v" parameters should be set to "1 / width" and "1 / height"
*/
var HorizontalBlurShader = {
uniforms: {
'tDiffuse': { value: null },
'h': { value: 1.0 / 512.0 }
},
vertexShader: /* glsl */`
varying vec2 vUv;
void main() {
vUv = uv;
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}`,
fragmentShader: /* glsl */`
uniform sampler2D tDiffuse;
uniform float h;
varying vec2 vUv;
void main() {
vec4 sum = vec4( 0.0 );
sum += texture2D( tDiffuse, vec2( vUv.x - 4.0 * h, vUv.y ) ) * 0.051;
sum += texture2D( tDiffuse, vec2( vUv.x - 3.0 * h, vUv.y ) ) * 0.0918;
sum += texture2D( tDiffuse, vec2( vUv.x - 2.0 * h, vUv.y ) ) * 0.12245;
sum += texture2D( tDiffuse, vec2( vUv.x - 1.0 * h, vUv.y ) ) * 0.1531;
sum += texture2D( tDiffuse, vec2( vUv.x, vUv.y ) ) * 0.1633;
sum += texture2D( tDiffuse, vec2( vUv.x + 1.0 * h, vUv.y ) ) * 0.1531;
sum += texture2D( tDiffuse, vec2( vUv.x + 2.0 * h, vUv.y ) ) * 0.12245;
sum += texture2D( tDiffuse, vec2( vUv.x + 3.0 * h, vUv.y ) ) * 0.0918;
sum += texture2D( tDiffuse, vec2( vUv.x + 4.0 * h, vUv.y ) ) * 0.051;
gl_FragColor = sum;
}`
};
export { HorizontalBlurShader };